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44 const uint8_t *
b = p->
buf;
46 if (
b[0] == 0x04 && (
b[1] == 0x00 ||
b[1] == 0x04 ||
b[1] == 0x0C ||
b[1] == 0x14))
97 int packet_size = 76*cdata->
channels;
113 .extensions =
"cdata",
static int cdata_read_header(AVFormatContext *s)
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
enum AVMediaType codec_type
General type of the encoded data.
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
int nb_channels
Number of channels in this layout.
static int cdata_probe(const AVProbeData *p)
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
@ AV_CHANNEL_ORDER_UNSPEC
Only the channel count is specified, without any further information about the channel order.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
@ AV_CODEC_ID_ADPCM_EA_XAS
const AVInputFormat ff_ea_cdata_demuxer
static int read_header(FFV1Context *f)
This structure contains the data a format has to probe a file.
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
An AVChannelLayout holds information about the channel layout of audio data.
static const uint8_t header[24]
int avio_r8(AVIOContext *s)
#define AV_LOG_INFO
Standard information.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
unsigned int avio_rb16(AVIOContext *s)
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
static int cdata_read_packet(AVFormatContext *s, AVPacket *pkt)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
#define AV_CHANNEL_LAYOUT_QUAD
#define AV_CHANNEL_LAYOUT_5POINT1_BACK